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Function Problem
The function \( f: \mathbb{R} \rightarrow \mathbb{R} \) satisfies the condition \( f(f(x)) = f(x) + x \). Determine all \( x \) such that \( f(f(x)) = 0 \).
Function
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The function \( f: \mathbb{R} \rightarrow \mathbb{R} \) satisfies the condition \( f(f(x)) = f(x) + x \). Determine all \( x \) such that \( f(f(x)) = 0 \).
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